Lens Power (Diopters) calculator
Optical power from focal length; combine two thin lenses in contact.
Category: Geometric Optics
Formula: P = 1/f · P_total = P₁ + P₂
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| f₁ | f1 | mm | 100 |
| f₂ (opt.) | f2 | mm | 200 |
Result with the default inputs
- P₁: 10 D
- P₂: 5 D
- P total: 15 D
- f total: 66.6667 mm
Open it with your own values: put each input in the address as a parameter, for example /calculators/lens-power-diopters?f1=100. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Optical power